I promised to go on with my yDna tests and add also "negative calls", i.e. ancestral SNPs. I have retested Stora Förvar 11, a sample from Gotland dated 7300-6800 BC and detected by me and another blogger as I1 . Before new results some background. If we look at the ISOGG 2019 nomenclature we see a significant difference between branches I1 and I2. There are 205 found positive calls under the classification I1, but only 22 under I2. I counted now only calls under titles I1 and I2, not any downstream mutations. This means that the time span in case of the title I1 is bigger and it also means that there is a lot of unknown history behind the I1 story. So when we say "it is only a title I1" we actually should say "it is I1 and many still unknown downstream mutations", almost 10 times more time and unknown downstream mutations than in case of I2. We don't know much about the prehistory of I1 until we have dated information of its "positive calls".
There were "positive calls" / derived values for Stora Forvar 11:
and there are "negative calls" / ancestral values:
We can say that Stora Förvar 11 belongs to the I1 branch and if we could infer the age he could be located around to the middle of the time span of the title level of I1 (11 derived and 10 ancestral SNPs). All ISOGG locations above I1 in I branch were derived and all below I1 were ancestral.